STEPS TO REPRODUCE
1. Launch iClone 6
2. Apply a non-standard character Foxy (Content pack: iClone Creature Base Pack - Pocket Pet Foxy)
3. Go to Modify > Edit > Avatar Proportion, click "Body" on the panel
4. Select "Right Arm" from the drop-down list
5. Drag the slider for Width

ACTUAL RESULT
Program crashes

EXPECTED RESULT
Program can work normally